As per the Openflow Specification-1.4, Section: 7.4.3.1 Modify Flow Table 
Message, Page:73,74:
"When the remaining space in the flow table increases to more than vacancy_up, 
and if vacancy up events are enabled, a vacancy up event must be generated to 
the controller using the OFPT_TABLE_STATUS message type with reason 
OFPTR_VACANCY_UP."

"When vacancy events are enabled on the table using the OFPTC_VACANCY_EVENTS 
flag, either the vacancy up or vacancy down event is enabled. When enabling 
events, if the current vacancy is less than vacancy_up, vacancy up events must 
be enabled, and vacancy down events must be disabled. When enabling events, if 
the current vacancy is greater or equal to vacancy_up, vacancy down events must 
be enabled, and vacancy up events must be disabled. When vacancy events are 
disabled on the table using the OFPTC_VACANCY_EVENTS flag, both vacancy up and 
vacancy down events must be disabled."

From the above statements,  "current vacancy" can be interpreted as occupancy 
of the flow table [(no. of. flows/max flows)*100] and not as remaining space of 
the table. As per my understanding current vacancy should denote the 
remaining/free space of the table.

Please help me understand the meaning of "current vacancy" -- whether it should 
be the remaining space percent or should be occupied space percentage ?

Thanks and Regards,
Saloni Jain
Tata Consultancy Services
Mailto: saloni.j...@tcs.com
Website: http://www.tcs.com
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